'use strict';

/**
 * Module dependencies.
 */
var mongoose = require('mongoose'),
	errorHandler = require('./errors.server.controller'),
	Form = mongoose.model('Form'),
	FormSubmission = mongoose.model('FormSubmission'),
	config = require('../../config/config'),
	diff = require('deep-diff'),
	_ = require('lodash');

/**
 * Delete a forms submissions
 */
exports.deleteSubmissions = function(req, res) {

	var submission_id_list = req.body.deleted_submissions,
		form = req.form;

	FormSubmission.remove({ form: req.form, admin: req.user, _id: {$in: submission_id_list} }, function(err){

		if(err){
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
			return;
		}

		form.analytics.visitors = [];
		form.save(function(err){
			if(err){
				res.status(400).send({
					message: errorHandler.getErrorMessage(err)
				});
				return;
			}
			res.status(200).send('Form submissions successfully deleted');

		});
	});
};

/**
 * Submit a form entry
 */
exports.createSubmission = function(req, res) {
	var form = req.form;

	var submission = new FormSubmission({
		admin: req.form.admin._id,
		form: req.form._id,
		title: req.form.title,
		form_fields: req.body.form_fields,
		timeElapsed: req.body.timeElapsed,
		percentageComplete: req.body.percentageComplete
	});

	//Save submitter's IP Address
	if(req.headers['x-forwarded-for'] || req.connection.remoteAddress){
		var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
		if(ip && process.env.NODE_ENV !== 'development') submission.ipAddr = ip;
	}

	if (req.device) {
		submission.device = req.device;
	}

	submission.save(function(err, submission){

		if (err) {
			console.error(err.message);
			return res.status(500).send({
				message: errorHandler.getErrorMessage(err)
			});
		}

		form.submissions.push(submission);

		form.save(function (err) {
			if (err) {
				console.error(err);
				return res.status(500).send({
					message: errorHandler.getErrorMessage(err)
				});
			}
			res.status(200).send('Form submission successfully saved');
		});
	});
};

/**
 * Get List of Submissions for a given Form
 */
exports.listSubmissions = function(req, res) {
	var _form = req.form;
	var _user = req.user;

	FormSubmission.find({ form: _form._id }).exec(function(err, _submissions) {
		if (err) {
			console.error(err);
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
		}
		res.json(_submissions);

	});

};

/**
 * Create a new form
 */
exports.create = function(req, res) {

	if(!req.body.form){
		console.log(err);
		return res.status(400).send({
			message: "Invalid Input"
		});
	}
	var form = new Form(req.body.form);

	form.admin = req.user._id;

	form.save(function(err) {
		if (err) {
			console.log(err);
			return res.status(405).send({
				message: errorHandler.getErrorMessage(err)
			});
		}

		res.json(form);
	});
};

/**
 * Show the current form
 */
exports.read = function(req, res) {

	FormSubmission.find({ form: req.form._id }).exec(function(err, _submissions) {
		if (err) {
			console.log(err);
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
		}


		var newForm = req.form.toJSON({virtuals : true});
		newForm.submissions = _submissions;

		if (req.userId) {
			if(req.form.admin._id+'' === req.userId+''){
				return res.json(newForm);
			}
			return res.status(404).send({
				message: 'Form Does Not Exist'
			});
		}
		return res.json(newForm);
	});
};

/**
 * Update a form
 */
exports.update = function(req, res) {
	var form = req.form;

	if (req.body.changes) {
		var formChanges = req.body.changes;

		formChanges.forEach(function (change) {
			diff.applyChange(form, true, change);
		});
	} else {
		//Unless we have 'admin' privileges, updating form admin is disabled
		if(req.user.roles.indexOf('admin') === -1) delete req.body.form.admin;

		//Do this so we can create duplicate fields
		var checkForValidId = new RegExp('^[0-9a-fA-F]{24}$');
		for(var i=0; i<req.body.form.form_fields.length; i++){
			var field = req.body.form.form_fields[i];
			if(!checkForValidId.exec(field._id+'')){
				delete field._id;
			}
		}
		form = _.extend(form, req.body.form);
	}

	form.save(function(err, form) {
		if (err) {
			console.log(err);
			res.status(405).send({
				message: errorHandler.getErrorMessage(err)
			});
		} else {
			res.json(form);
		}
	});
};

/**
 * Delete a form
 */
exports.delete = function(req, res) {
	var form = req.form;
	// console.log('deleting form');
	Form.remove({_id: form._id}, function(err) {
		if (err) {
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
		} else {
			// console.log('Form successfully deleted');
			// res.status(200).send('Form successfully deleted');
			res.json(form);
		}
	});
};

/**
 * Get All of Users' Forms
 */
exports.list = function(req, res) {
	//Allow 'admin' user to view all forms
	var searchObj = {admin: req.user};
	if(req.user.isAdmin()) searchObj = {};

	Form.find(searchObj).sort('-created').populate('admin.username', 'admin._id').exec(function(err, forms) {
		if (err) {
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
		} else {
			res.json(forms);
		}
	});
};

/**
 * Form middleware
 */
exports.formByID = function(req, res, next, id) {
	if (!mongoose.Types.ObjectId.isValid(id)) {
		return res.status(400).send({
			message: 'Form is invalid'
		});
	} else {
		Form.findById(id).populate('admin').populate('submissions').exec(function(err, form) {
			if (err) {
				return next(err);
			} else if (form === undefined || form === null) {
				res.status(404).send({
					message: 'Form not found'
				});
			}
			else {
				//Remove sensitive information from User object
				var _form = form;
				_form.admin.password = undefined;
				_form.admin.salt = undefined;
				_form.provider = undefined;

				req.form = _form;
				return next();
			}
		});
	}
};

/**
 * Form authorization middleware
 */
exports.hasAuthorization = function(req, res, next) {
	var form = req.form;
	if (req.form.admin.id !== req.user.id && req.user.roles.indexOf('admin') === -1) {
		res.status(403).send({
			message: 'User '+req.user.username+' is not authorized to edit Form: '+form.title
		});
	}
	return next();
};